If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

How can a man go eight days without sleep?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What's a single-digit number with no value?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?